Demetri Psaltis, Caltech

1
Holographic Wavelength Filters
Demetri Psaltis, Caltech
OUTLINE

• Holographic filters
• Tunable filters
• Tunable WDM architectures

2
Recording
3
Read-out
??/2
4
(No Transcript)
5
(No Transcript)
6
Piezoelectric mirror
Stabilized Recording
Detector
Detector
Control
7
Holographic Add-Drop Filter
in
add
drop
thru
8
(No Transcript)
9
Fiber coupling
Grin lens
Ferule
INPUT FIBER
To express collimator
DROP FIBER
PASSBAND SHAPING BY COUPLING ADJUSTMENT
10
Cross-talk
Grin lens
Ferule
INPUT FIBER
EXPRESS FIBER
DROP FIBER
20 dB extra extinction by fiber coupling. No
cladding Modes.
11
Polarization dependent loss
In-band PDL ( 10 GHz) lt 0.2 dB Polarization
dependant shift 1.2 GHz
12
Side-lobe suppression
1st pass
2nd pass
Double passing through grating
13
Side-lobe suppression
with apodization
without apodization
14
Chromatic dispersion
15
Emitter frequency drift power penalty
4
Rx threshold kept constant, optimised at
193.699THz
3
"Cross" input light
polarisation
2
"Bar" input light
penalty (dB)
polarisation
1
16GHz
Bandwidth available
0
Channel 17 PRBS215-1 32 WDM channels
-1
193,68
193,69
193,7
193,71
193,72
Frequency (THz)
Courtesy of Alcatel
16
Tunable Add-drop filter block diagram
origin
destination
l2
ADD
fiber
l1
l1
l2
l2
IN
EXPRESS
l3
l3
l2
DROP
17
Tunable Add-drop filter block diagram
origin
destination
l3
ADD
fiber
l1
l1
l2
l2
IN
EXPRESS
l3
l3
l3
DROP
18
EXPRESS
INPUT
ADD
DROP
Dual fiber collimator
Dual fiber collimator
19
Tunable filter
20
Tunable filter
21
Tunable filter
22
Tunable filter
23
(No Transcript)
24
RECONFIGURABLE WAVELENGTH ROUTING
Tunable add-drop filters (hitless)
25
Hitless tuning